from __future__ import unicode_literals

moto/sts/__init__.py

@@ -1,2 +1,3 @@
+from __future__ import unicode_literals
 from .models import sts_backend
 mock_sts = sts_backend.decorator

moto/sts/models.py

@@ -1,3 +1,4 @@
+from __future__ import unicode_literals
 import datetime
 from moto.core import BaseBackend
 from moto.core.utils import iso_8601_datetime

moto/sts/responses.py

@@ -1,3 +1,4 @@
+from __future__ import unicode_literals
 from jinja2 import Template
 
 from moto.core.responses import BaseResponse

moto/sts/urls.py

@@ -1,3 +1,4 @@
+from __future__ import unicode_literals
 from .responses import TokenResponse
 
 url_bases = [